TWM600855U - Display panel - Google Patents

Abstract

A display panel including a first substrate, a second substrate, a liquid crystal layer, a first quarter-wave plate, and a first polarizer is provided. The second substrate is opposite to the first substrate. The liquid crystal layer is disposed between the first substrate and the second substrate. The first quarter-wave plate and the first polarizer are disposed on a surface of the first substrate far from the second substrate in sequence. A twist angle of a liquid crystal of the liquid crystal layer is 50 DEG~90 DEG, and an acute angle between a transmission axis of the first polarizer and a slow axis of the first quarter-wave plate is 35 DEG~75 DEG.

Description

Display panel

The present invention relates to a display panel, and particularly relates to a display panel with reduced thickness.

The conventional display panel usually has a wave plate and a polarizer on the upper surface and the lower surface, respectively, to adjust the polarization state of the light beam, thereby making the light beam emitted from the display panel have better intensity and contrast.

If the thickness of the display panel can be reduced without affecting the intensity and contrast of the light beam emitted from the display panel, the display panel can be further optimized to increase the user's willingness to purchase.

The present invention provides a display panel that has a reduced thickness and still maintains a better display quality.

The display panel of the present invention includes a first substrate, a second substrate, a liquid crystal layer, a first quarter wave plate and a first polarizer. The second substrate is opposite to the first substrate. The liquid crystal layer is disposed between the first substrate and the second substrate. The first quarter wave plate and the first polarizer are sequentially arranged on the surface of the first substrate away from the second substrate. The liquid crystal twist angle of the liquid crystal layer is 50°-90°, and the acute angle between the penetration axis of the first polarizer and the slow axis of the first quarter-wave plate is 35°-75°.

In an embodiment of the present invention, the above-mentioned acute angle increases as the gap between the first substrate and the second substrate in the penetration area increases.

，其中Ө ₁₂的單位為度，且CG的單位為μm。 In an embodiment of the present invention, if the acute angle is Ө ₁₂ and the liquid crystal cell gap is CG, the acute angle and the liquid crystal cell gap conform to the following relationship:

, Where the unit of Ө ₁₂ is degree, and the unit of CG is μm.

In an embodiment of the present invention, the aforementioned display panel further includes a second quarter-wave plate, a half-wave plate, and a second polarizer that are sequentially arranged on the surface of the second substrate away from the first substrate.

In an embodiment of the present invention, the aforementioned first substrate includes a first alignment layer, and the second substrate includes a second alignment layer.

In an embodiment of the present invention, the above-mentioned first substrate includes a reflective electrode, wherein the area where the reflective electrode is provided is defined as the reflective area, and the area exposed by the reflective electrode is defined as the penetrating area.

In an embodiment of the present invention, the above-mentioned first substrate is an active device array substrate, and the second substrate is a color filter substrate.

Based on the above, the display panel proposed by the present invention is not provided with a half-wave plate on the surface of the first substrate away from the second substrate, so the thickness of the display panel can be reduced. In addition, the liquid crystal twist angle of the liquid crystal layer in the display panel proposed by the present invention and the acute angle between the penetration axis of the first polarizer and the slow axis of the first quarter wave plate have the above specific ranges. Therefore, the display panel proposed by the present invention still has good display quality.

In order to make the above-mentioned features and advantages of the new creation more obvious and understandable, the following embodiments are specially cited, and the accompanying drawings are described in detail as follows.

FIG. 1 is a schematic partial cross-sectional view of a display panel according to an embodiment of the invention.

1, the display panel 10 of this embodiment includes a first substrate 100, a second substrate 200, a liquid crystal layer 300, a first quarter wave plate Q1, and a first polarizer P1. The display panel 10 of this embodiment is a semi-transmissive display panel with a single cell gap, but it should be noted that the invention of the present invention is not limited to this.

The first substrate 100 and the second substrate 200 are disposed opposite to each other, for example. In this embodiment, the first substrate 100 is an active device array substrate, and the second substrate 200 is a color filter substrate, but the invention is not limited to this. In some embodiments, the first substrate 100 may include a reflective electrode 110 and a penetrating electrode 120. The reflective electrode 110 is disposed on the penetrating electrode 120 and is closer to the second substrate 200 than the penetrating electrode 120 (ie, closer to the display panel). 10 display surface). The area where the reflective electrode 110 is set can be used to define the reflective area A1. For example, the reflective electrode 110 includes a material that can reflect light, which can be a metal, a metal nitride, an alloy, or a combination thereof, so as to reflect the ambient light to emit the light beam B1. In contrast, the area where the penetrating electrode 120 is exposed by the reflective electrode 110 can define the penetrating area A2. For example, the penetrating electrode 120 includes a material that can penetrate light, which may be a metal oxide, so that the light beam B2 emitted by the backlight light source can penetrate. In addition, the first substrate 100 and the second substrate 200 may each include a first alignment layer AL1 and a second alignment layer AL2. The first alignment layer AL1 and the second alignment layer AL2 can be formed, for example, by rubbing the polyimide film, so that the plurality of liquid crystal molecules LC included in the liquid crystal layer 300 can be achieved due to the force between the molecules. Directional effect.

The liquid crystal layer 300 is, for example, disposed between the first substrate 100 and the second substrate 200. In some embodiments, the liquid crystal layer 300 includes a plurality of liquid crystal molecules LC. In this embodiment, the liquid crystal molecules LC are nematic liquid crystals, which can be controlled by the first alignment layer AL1 included in the first substrate 100 and the second alignment layer AL2 included in the second substrate 200 according to a specific direction and predetermined Arranged at an angle.

The first quarter wave plate Q1 and the first polarizer P1 are, for example, sequentially arranged on the surface S1 of the first substrate 100 away from the second substrate 200. In detail, the first quarter wave plate Q1 and the first polarizer P1 are sequentially arranged on the surface S1 of the first substrate 100 away from the second substrate 200 in the direction z. Based on this, no half-wave plate is disposed on the surface S1 of the first substrate 100 away from the second substrate 200. In order to prevent the light intensity and contrast of the beam B2 emitted from the penetration area A2 from being affected by the lack of the above-mentioned half-wave plate, the penetration axis of the first polarizer P1 and the slow axis of the first quarter-wave plate Q1 The angle between them and the liquid crystal twist angle of the liquid crystal layer 300 need to be specially designed. In this regard, in this embodiment, the liquid crystal twist angle of the liquid crystal layer 300 is designed to be 50°~90°, and the penetration axis of the first polarizer P1 and the slow axis of the first quarter wave plate Q1 are sandwiched between The acute angle of A2 is designed to be 35°~75°, so that the light intensity and contrast of the light beam B2 emitted from the penetrating area A2 are not reduced, so that the display panel 10 of this embodiment still has a good display quality.

It is worth mentioning that the display panel 10 of this embodiment may further include a second quarter-wave plate Q2, a half-wave plate H, and a second polarizer P2, wherein the second quarter-wave plate Q2, a half-wave plate The sheet H and the second polarizer P2 are sequentially arranged on the surface S2 of the second substrate 200 away from the first substrate 100. The directions of the slow axis of the second quarter-wave plate Q2, the slow axis of the half-wave plate H, and the penetration axis of the second polarizer P2 can be adjusted by those with ordinary knowledge in the art, and the creation of this new type will not be repeated.

2 illustrates the first alignment direction of the first alignment layer in FIG. 1 and the second alignment direction of the second alignment layer in the same reference plane, the slow axis of the first quarter wave plate in the reference plane and the first An embodiment in which the penetration axis of the polarizer is projected on the reference plane.

Please refer to FIG. 2, which illustrates the first alignment direction D1 of the first alignment layer AL1 and the second alignment direction D2 of the second alignment layer AL2 in the same reference plane R1, the slow axis Q11 of the first quarter wave plate Q1 In the case where the reference plane R2 and the penetration axis P11 of the first polarizer P1 are projected on the reference plane R3, the normal direction of the reference planes R1, R2, and R3 is the direction z shown in FIG. 1.

Please continue to refer to FIG. 2. In this embodiment, the first alignment angle α ₁ of the first alignment layer AL1 is 125° (that is, the angle between the reference plane R1 and the positive x-axis in the counterclockwise direction. The following similar situations are no longer To repeat), and the second alignment angle α ₂ of the second alignment layer AL2 is set to 215°~255°, so that the liquid crystal twist angle TA of the liquid crystal layer 300 is designed to be 50°~90°. In this embodiment, the second alignment angle α ₂ of the second alignment layer AL2 is 235°, so that the liquid crystal twist angle TA of the liquid crystal layer 300 is designed to be 70°, but it should be noted that the invention is not limited to this. In this case, the angle of the liquid crystal average direction LD of the liquid crystal molecules LC in the liquid crystal layer 300 is 90°. In addition, when the half-wave plate is not configured, the angle between the penetration axis P11 of the first polarizer P1 and the average liquid crystal direction LD of the liquid crystal molecules LC is 45°, that is, the penetration of the first polarizer P1 The angle Ө ₁ of the axis P11 is 135°. In order to make the acute angle ₁₂ between the penetration axis P11 of the first polarizer P1 and the slow axis Q11 of the first quarter wave plate Q1 be 35°~75°, the first quarter wave plate Q11 Q1 of the slow axis angle Ө ₂ is 60 ° ~ 100 °. In this embodiment, the angle ₂ of the slow axis Q11 of the first quarter-wave plate Q1 is 83°, so that the penetration axis P11 of the first polarizer P1 and the slow axis of the first quarter-wave plate Q1 The acute angle Ө ₁₂ sandwiched between the axis Q11 is designed to be 52°, but it should be noted that the creation of the new model is not limited to this.

Considering the optimization of optics, the above-mentioned angles α ₁ , α ₂ , Ө ₁ and Ө ₂ can all be fine-tuned. Therefore, within ±20 degrees of the above-mentioned angle values are regarded as the same as the design concept of the new creation. It falls within the scope of protection intended for the creation of this new type.

It is worth mentioning that as long as the liquid crystal twist angle TA of the liquid crystal layer 300 is designed to be 50°~90° and the penetration axis P11 of the first polarizer P1 and the slow axis Q11 of the first quarter wave plate Q1 are set The acute angle Ө ₁₂ sandwiched between is designed to be 35°~75°, and the above-mentioned angles α ₁ , α ₂ , Ө ₁ and Ө ₂ can be adjusted freely according to requirements.

3 illustrates the first alignment direction of the first alignment layer in FIG. 1 and the second alignment direction of the second alignment layer in the same reference plane, the slow axis of the first quarter wave plate in the reference plane and the first Another embodiment in which the penetration axis of the polarizer is projected on the reference plane.

3, in this embodiment, the first alignment angle α ₁ of the first alignment layer AL1 is 113°, and the second alignment angle α ₂ of the second alignment layer AL2 is 203°~243°, so that the liquid crystal layer The 300 liquid crystal twist angle TA is designed to be 50°~90°. In this embodiment, the second alignment angle α ₂ of the second alignment layer AL2 is 223°, so that the liquid crystal twist angle TA of the liquid crystal layer 300 is designed to be 70°, but it should be noted that the invention is not limited to this. In this case, the angle of the liquid crystal average direction LD of the liquid crystal molecules LC in the liquid crystal layer 300 is 78°. In addition, when the half-wave plate is not configured, the angle between the penetration axis P11 of the first polarizer P1 and the average liquid crystal direction LD of the liquid crystal molecules LC is 45°, that is, the penetration of the first polarizer P1 The angle Ө ₁ of the axis P11 is 123°. In order to make the acute angle ₁₂ between the penetration axis P11 of the first polarizer P1 and the slow axis Q11 of the first quarter wave plate Q1 be 35°~75°, the first quarter wave plate Q11 Q1 of the slow axis angle Ө ₂ is 48 ° ~ 88 °. In this embodiment, the angle ₂ of the slow axis Q11 of the first quarter-wave plate Q1 is 71°, so that the penetration axis P11 of the first polarizer P1 and the slow axis P11 of the first quarter-wave plate Q1 The acute angle Ө ₁₂ sandwiched between the axis Q11 is designed to be 52°, but it should be noted that the creation of the new model is not limited to this.

Based on the foregoing, the display panel of this embodiment is not provided with a half-wave plate on the surface of the first substrate away from the second substrate, so the thickness of the display panel can be reduced. In addition, the liquid crystal twist angle of the liquid crystal layer of this embodiment and the acute angle between the penetration axis of the first polarizer and the slow axis of the first quarter wave plate have the above-mentioned specific range, which can be in the first If the half-wave plate is not arranged on the surface of the substrate away from the second substrate, the light intensity and contrast of the light beam emitted from the penetrating area will not be reduced. Therefore, the display panel of this embodiment still has good display quality.

4 shows the relationship between the acute angle between the transmission axis of the first polarizer and the slow axis of the first quarter wave plate and the gap of the liquid crystal cell in the transmission region according to FIG. 1.

，其中Ө ₁₂的單位為度，且CG的單位為μm。 4, in order to further improve the transmission optics of the display panel 10 (ie, to increase the light intensity and contrast of the light beam B2 emitted from the penetration area A2), the penetration axis P11 of the first polarizer P1 and the first quarter The acute angle Ө ₁₂ between the slow axis Q11 of the one-wave plate Q1 increases as the cell gap CG between the first substrate 100 and the second substrate 200 in the penetration area A2 increases. In detail, in this embodiment, the acute angle Ө ₁₂ sandwiched between the transmission axis P11 of the first polarizer P1 and the slow axis Q11 of the first quarter wave plate Q1 is the same as that in the transmission area A2. The liquid crystal cell gap CG conforms to the following relationship:

, Where the unit of Ө ₁₂ is degree, and the unit of CG is μm.

For example, when the cell gap CG in the penetrating area A2 is 1.5 μm, the penetrating axis P11 of the first polarizer P1 and the slow axis Q11 of the first quarter wave plate Q1 are sandwiched between The acute angle Ө _{12 is} designed to be 35°. When the cell gap CG in the penetrating area A2 is 3 μm, the penetrating axis P11 of the first polarizer P1 and the slow axis Q11 of the first quarter wave plate Q1 The acute angle _{12 is} designed to be 55°, and when the cell gap CG in the penetrating area A2 is 4.5 μm, the penetrating axis P11 of the first polarizer P1 and the first quarter wave plate Q1 The acute angle Ө ₁₂ between the slow axis Q11 is designed to be 75°.

For further details, please refer to both Figure 2 and Figure 4. In this embodiment, the liquid crystal cell gap CG in the penetrating area A2 is 3.375 μm. Based on this, according to the foregoing relationship, the first polarized light of this embodiment The acute angle Ө ₁₂ between the penetration axis P11 of the plate P1 and the slow axis Q11 of the first quarter wave plate Q1 is designed to be about 60°. In detail, in this embodiment, the first alignment angle α ₁ of the first alignment layer AL1 is 125°, and the second alignment angle α ₂ of the second alignment layer AL2 is 235°, so that the liquid crystal twist angle of the liquid crystal layer 300 is TA is designed to be 70°. In this case, the angle of the liquid crystal average direction LD of the liquid crystal molecules LC in the liquid crystal layer 300 is 90°. In addition, when the half-wave plate is not configured, the angle between the penetration axis P11 of the first polarizer P1 and the average liquid crystal direction LD of the liquid crystal molecules LC is 45°, that is, the penetration of the first polarizer P1 The angle Ө ₁ of the axis P11 is 135°. In order to make the acute angle ₁₂ between the penetration axis P11 of the first polarizer P1 and the slow axis Q11 of the first quarter wave plate Q1 60°, the slow axis of the first quarter wave plate Q1 The angle Ө ₂ of the axis Q11 is 75°.

This embodiment adjusts the acute angle between the penetration axis of the first polarizer and the slow axis of the first quarter-wave plate according to the size of the liquid crystal cell gap in the penetration area, thereby further improving the performance. Transmission optics of the display panel of the embodiment.

In summary, the display panel proposed by the present invention is not provided with a half-wave plate on the surface of the first substrate away from the second substrate, so the thickness of the display panel can be reduced. In addition, the liquid crystal twist angle of the liquid crystal layer in the display panel proposed by the present invention and the acute angle between the penetration axis of the first polarizer and the slow axis of the first quarter wave plate have the above specific ranges. It can prevent the light intensity and contrast of the light beam emitted from the penetrating area from being reduced when the half-wave plate is not arranged on the surface of the first substrate away from the second substrate. Therefore, the display panel proposed by the present invention still has good display quality.

Furthermore, the present invention finds the best relationship between the liquid crystal cell gap in the penetrating area and the acute angle between the penetrating axis of the first polarizer and the slow axis of the first quarter wave plate In this way, the transmission optics of the display panel of this embodiment can be further improved.

Although the creation of this new type has been disclosed in the above embodiments, it is not intended to limit the creation of this new type. Anyone with ordinary knowledge in the technical field can make some changes and changes without departing from the spirit and scope of the new creation. Retouching, therefore, the scope of protection of the creation of the new model shall be subject to the scope of the attached patent application.

10: display panel 100: first substrate 110: reflective electrode 120: penetrating electrode 200: second substrate 300: liquid crystal layer A1: reflective area A2: penetrating area AL1: first alignment layer AL2: second alignment layer B1 B2: beam CG: liquid crystal cell gap D1, D2, z: direction H: half-wave plate LC: liquid crystal molecules LD: liquid crystal average direction P1: first polarizer P11: penetration axis P2: second polarizer Q1: first Quarter wave plate Q11: slow axis Q2: second quarter wave plate R1, R2, R3: reference plane S1, S2: surface TA: liquid crystal twist angle α ₁ , α ₂ , Ө ₁ , Ө ₂ : Angle Ө ₁₂ : acute angle

FIG. 1 is a schematic partial cross-sectional view of a display panel according to an embodiment of the invention. 2 illustrates the first alignment direction of the first alignment layer in FIG. 1 and the second alignment direction of the second alignment layer in the same reference plane, the slow axis of the first quarter wave plate in the reference plane and the first An embodiment in which the penetration axis of the polarizer is projected on the reference plane. 3 illustrates the first alignment direction of the first alignment layer in FIG. 1 and the second alignment direction of the second alignment layer in the same reference plane, the slow axis of the first quarter wave plate in the reference plane and the first Another embodiment in which the penetration axis of the polarizer is projected on the reference plane. 4 shows the relationship between the acute angle between the transmission axis of the first polarizer and the slow axis of the first quarter wave plate and the gap of the liquid crystal cell in the transmission region according to FIG. 1.

10: Display panel

100: first substrate

110: reflective electrode

120: penetration electrode

200: second substrate

300: liquid crystal layer

A1: reflection area

A2: Penetration area

AL1: The first alignment layer

AL2: second alignment layer

B1, B2: beam

CG: LCD cell gap

H: Half wave plate

LC: Liquid crystal molecules

P1: The first polarizer

P2: second polarizer

Q1: The first quarter wave plate

Q2: The second quarter wave plate

S1, S2: surface

z: direction

Claims (7)

A display panel having a reflection area and a penetration area, including: First substrate The second substrate is arranged opposite to the first substrate; A liquid crystal layer disposed between the first substrate and the second substrate; and The first quarter wave plate and the first polarizer are sequentially arranged on the surface of the first substrate away from the second substrate, The liquid crystal twist angle of the liquid crystal layer is 50°~90°, The acute angle between the penetration axis of the first polarizer and the slow axis of the first quarter wave plate is 35°-75°. The display panel according to claim 1, wherein the acute angle increases as a liquid crystal cell gap between the first substrate and the second substrate in the penetration area increases. The display panel according to claim 2, wherein if the acute angle is Ө ₁₂ and the liquid crystal cell gap is CG, the acute angle and the liquid crystal cell gap conform to the following relationship:

, Where the unit of Ө ₁₂ is degree, and the unit of CG is μm. The display panel according to claim 1, further comprising a second quarter-wave plate, a half-wave plate, and a second polarizer that are sequentially arranged on the surface of the second substrate away from the first substrate. The display panel according to claim 1, wherein the first substrate includes a first alignment layer, and the second substrate includes a second alignment layer. The display panel according to claim 1, wherein the first substrate includes a reflective electrode, wherein the area provided with the reflective electrode is defined as the reflective area, and the area exposed by the reflective electrode is defined as the Penetration zone. The display panel according to claim 1, wherein the first substrate is an active device array substrate, and the second substrate is a color filter substrate.

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